Drill collar



W. V., SEIFERT DMLL emma Mg, 192;. mmvggw 6 Filed April l5, 1926 umn;

INVENTOR.

Patented Feb. 12, 19219.

untreu-STATES WILLIAM V. SEIFERT, 0F DENVER, COLORADO.

Daim. COLLAR.

Application filed April 13,

This invention relates to drill collars and its principal object is to provide a practical; convenient and reliable medium for the conf ncction of a drill bit at the lower end of a drill pipe in rotary drills of the type used in sinking wells.

Another object is to provide a combination of drill collar and drill bit by which the latter is held in its voperative relation to the drill pipe so as to be readily removable and so that it may be adjusted to a limited extent for the purpose of cleaning or repair.

A further object of the invention is to provide in a combination of the above described character, means for the passage of water to the cutting edges of the drill bit, in bits of the flat or fishtail type as Well as in bits in which the cutters are mounted upon a supporting body, and still other objects reside in details of construction as will appear in the course of the following description.

In the accompanying drawings in the several views of which like parts are similarly designated, n

Figure 1, represents a sectional elevation of a drill collar in connection with a drill bit of the type in which rotary cutters are mounted on a supporting body,

Figure 2, a fragmentary section along the line 2-2 Figure 1,

Figure 8, a bottom view of the drill bit shown in Figure l,

Figure 4, an enlarged bottom view of the collar of the construction shown in Figures 1 and 2, after the drill bit is removed,

'Figure 5, a fragmentary longitudinal section of the collar shown in Figure 1, without the drill bit, drawn to an enlarged scale,

Figure 6, a section along the line 6-6 Figure 5,

Figure 7, a fragmentary side elevation of the collar and drill bit shown in Figures 1 and 2,

Figure 8, an enlarged section taken on the line 8 8 Figures 1 and 2,

Figure 9, a fragmentary sectional elevation of a collar of modied form together with a drill bit of the lishtail type, 'and Figure 10, a transverse section on the line 10-10 Figure 9.

Referring further to the drawings, the collar illustrated in Figures 1 to 8, consists of a hollow body 5, having at its upper end a screw-threaded nipple 6, for its attachment in a correspondingly threaded socket at the 1926. .Serial No. 101,719.

lower end ofthe drill pipe of the drilling tool (not shown in the drawings), and having its lower end enlarged to provide a Haring socket 7, for the reception of the drill bit.,

The bit, as shown, consists of a body 8, having atits lower surface bearings for the support o'f rotary sharp-edged cutting disks 9, which in the operation eXcavate the rock to form the well.

The body 8, has a reduced portion 10, fitting snugly within the lower end of the socket of the collar, made preferably in oval form, and centrally of said reduced portion, a flat shank l2, which in practice extends between two pairs of hollow bosses 13, in the inside of the socket.

The shank is tapered to conform with the taper of the socket and it is provided with two slots 14, which register with the openings of the bosses at opposite sides of the socket.

Extensions of the bosses at the outside of the collar are transversely apertured for the admission of locking keys or cotters 15, it being the purpose of the bosses, to support two p ins 16, which secure the drill bit in its operative posltion with relation to the collar.

The pins have transverse openings at one of their ends, which register with the before mentioned transverse openings of the bosses exterlorly of the collar, and the cotters driven through the openings lock the pins against accidental displacement.

It will be observed that by the application of the pins as shown, and the lit of the drill bit relative to the socket of the collar, the bit is maintained in operative relation to the ldrill `pipe of the tool while it is readily removed or may be adjusted to the extent of the length of its slots for the purpose of furnishing a passage for water and mud around outside of bit 1n order that a sample of the formation may be taken in the hollow of the bit. Moreover, when the bit is plugged, by lifting drill pipe slightly ed the bottom of the well, the Water is'permitted to circulatearound the body of the bit.l This puts water in motion and by letting the drill stem down suddenly on the bit, the water delivers aY blow on the plug which drives it from the bit.

The flat shank insures the rotative continuity of the drill bit with the collar and the drill bit is, as usual, axially bored to admit water introduced into the hollow collar from the drill pipe to the cutting disks.

omitted yand the flat and tapering shank'lS, ofk n the bit 19,'ts within the correspondingly In the form of the invention illustrated in 1`iggures 9 and 10, the collar is constructed for the connection of a, drill bitof the ish tail type. l

The bosses on the inside of thecollar 17, are

` shaped socket of the collr. l y

' The' henk iss'loued as inthe first d egrib'ed.

1Q. V I if l slots are', as "be'for'e supported in'openlngs at,

thecol erv v l, Thel bitis longitudinally luted on:r both, sides for theV passage to its ycutting edgeof Water yfed into the hollow collar from tliedrill forni', :and pinsQO, passing looselythroug'hthel vvol posite sides of thesocliet beld'ztgainst Vdl's'placeni'ent byv cotters 21," extending `in' transverse bores of tbel pins and therewith reg.

is'trn apertures in bosses atftheienterorfof pipe withwhichhit is connected. l

Inboth forms'of the invention the drill bits are shouldered to engage with'thelower end" of the keollar whichv therebyV receives theim-v I pact of` the `engegement of tbe, ybits." W'thfthe.

work in the operation of-the drill tool of which it is a part.

Having thus described my invention, what I claim and desire to secure by Letters Patentis: 2 l

l. In a drilling tool,v the combination with collar having asocket, of a drillbit mounted in said socket to move lengthwise with relal tionfthereto, lthe-bit closing' the i end of said v socket in the voperetijve positionand providing 2arpa"ssage for water between thecollar and the bitlijn anindpergitiveposition.

f L2. In k:i 'drilling tool, the combinzition with a collar having uv Water passege,ofa drill bit mounted in said passage to move :lengthwise with relation thereto, the bit closing the passagewhen in an, operativecutting positionV and ,providing an .outlet for Qwaterin the-passage between the collar and the bit in an inoperative position.

In testimony T l SLIIEERT.

wliereo I V bavehereuntoc 

